Nintendo has announced an untitled Mario & Luigi RPG for release on 3DS this summer.

The game's levels take place in Luigi's dreams, Nintendo president Satoru Iwata has revealed in a new Nintendo Direct broadcast.

Mario Golf developer Camelot is also working on a new installment of the series for 3DS.

Nintendo is also working on an expansion pack for New Super Mario Bros. U starring Luigi. It's called New Super Luigi U. Existing levels will be re-worked, Iwata revealed. The "extensive" DLC will be due out later this year.

In other news, Nintendo's spooky sequel Luigi's Mansion: Dark Moon will be released in Europe on 28th March, in shops and digitally from the 3DS eShop.

This time Luigi has a number of mansions to explore, and more uses for his trusty Poltergust vaccum cleaner.

Luigi can now blow out air from the Poltergust to fill up balloons, and float upwards to explore higher-up areas.

There's a new character, too: a ghost dog that steals items from Luigi. You'll have to use a "Darklight device" to track the pooch's footprints and hunt him down.

Nintendo is developing a new version of side-scrolling Wii platformer Donkey Kong Country Returns for 3DS.

It's being "rebuilt from the ground up", Nintendo Europe leader Satoru Shibata said in the company's just-concluded Nintendo Direct conference.

No other details of the game were mentioned, save for a vague "summer" launch window.

Donkey Kong Country Returns was released to a warm reception on Wii back in 2010. It was the handiwork of acclaimed Metroid Prime developer Retro Studios, although its unclear if Retro are working on this version as well.